I have an additional question.
Regarding VREF accuracy, at JEDEC standard the accuracy is defined +/-2%. However the accuracy of LP2998 is exceed that standard.
LP2998 ; VREF_max = 0.937V@VDDQ=1.8V and VREF_max = 0.986V@VDDQ=1.9V.
JEDEC standard ; VREF_max = 0.51*VDDQ @VDDQ=1.7~1.9V.
(e.g. if VDDQ=1.9V, VREF_max=0.969V.)
So that, I think LP2998 does not meet JEDEC standard. Is my understanding correct?